Which phase contributed to the Harlem Renaissance? What is the connection?

The northern Manhattan neighborhood of Harlem was meant to be an upper-class white neighborhood in the 1880s, but rapid overdevelopment led to empty buildings and desperate landlords seeking to fill them.
In the early 1900s, a few middle-class Black families from another neighborhood known as Black Bohemia moved to Harlem, and other Black families followed. Some white residents initially fought to keep African Americans out of the area, but failing that many whites eventually fled. From 1910 to 1920, African American populations migrated in large numbers from the South to the North, with prominent figures like W.E.B. Du Bois leading what became known as the Great Migration. The Harlem Renaissance was the development of the Harlem neighborhood in New York City as a Black cultural mecca in the early 20th Century and the subsequent social and artistic explosion that resulted. Lasting roughly from the 1910s through the mid-1930s, the period is considered a golden age in African American culture, manifesting in literature, music, stage performance and art. The Harlem Renaissance was an overall safe place for the black community.